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Proceedings of Meetings on Acoustics

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POMA - 154th Meeting Acoustical Society of America
Conference Location: New Orleans, Louisiana Conference Date: 27 November - 1 December 2007
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Sound recordings from the 2007 emergence of Brood XIII cicada

Ralph T. Muehleisen

POMA Volume 2, pp. 010001 (April 2008); (7 pages)

Online Publication Date: April 07, 2008

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Level calibrated recordings of the Brood XIII 17-year periodic cicadas were made in June, 2007 in River Forest, Illinois. Brood XIII consists of three separate species: Magicicada cassini, M. septendecim, and the more rare M. septendecula. Power spectrum analysis of a 2 min segment of the recording shows a 5.95 kHz resonance with Q~6, indicative of cassini, and a 5 dB lower resonance at 1.35 kHz with a Q~13.5, indicative of septendecim. Since other researchers have estimated that the power of septendecim is 20 dB below that of cassini, the high level of the septendecim song suggests that 30 times more septendecim than cassini were singing. Computation of the sound pressure level shows a 2-5 dB variation with a period of 7.5 s, indicative of synchronized chorus singing of cassini.
Show PACS
43.28.Hr Outdoor sound sources
43.50.Rq Environmental noise, measurement, analysis, statistical characteristics
43.80.Ka Sound production by animals: mechanisms, characteristics, populations, biosonar
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